Mvc3 Antiforgery令牌多标签

Question

我们在登录页面上遇到了防伪标记的特定问题.如果用户只使用一个活动窗口登录,则一切正常,但是如果用户在两个不同的窗口中打开登录页面并从窗口A登录(没有问题将登录),则返回到此窗口中的窗口B登录用户将收到"未提供所需的防伪标记或无效".

有没有办法解决这个问题,然后从视图/控制器动作中删除防伪标记？我们宁愿拥有令牌以获得额外的安全性!

这与此问题非常相似,但是这被要求提供mvc2 MVC ValidateAntiForgeryToken多标签问题

Answer 1

MVC3或MVC4中的这种行为是按照设计的,但如上所述,它对用户不友好,但是在生产中,这个问题需要优雅地解决,应用程序需要处理这种奇怪的情况.此问题的解决方案是创建一个应用于登录帖子的过滤器,该过滤器将验证用户是否已登录并将其带到正确的页面,否则它们将保留在登录页面上.

下面是filter属性的代码

/// <summary>
/// Handle Antiforgery token exception and redirect to customer area if the user is Authenticated
/// </summary>
public class RedirectOnError : HandleErrorAttribute
{
    /// <summary>
    /// Override the on exception method and check if the user is authenticated and redirect the user 
    /// to the customer service index otherwise continue with the base implamentation
    /// </summary>
    /// <param name="filterContext">Current Exception Context of the request</param>
    public override void OnException(ExceptionContext filterContext)
    {
        if (filterContext.Exception is HttpAntiForgeryException && filterContext.HttpContext.User.Identity.IsAuthenticated)
        {
            // Set response code back to normal
            filterContext.HttpContext.Response.StatusCode = 200;

            // Handle the exception
            filterContext.ExceptionHandled = true;

            UrlHelper urlH = new UrlHelper(filterContext.HttpContext.Request.RequestContext);

            // Create a new request context
            RequestContext rc = new RequestContext(filterContext.HttpContext, filterContext.RouteData);

            // Create a new return url
            string url = RouteTable.Routes.GetVirtualPath(rc, new RouteValueDictionary(new { Controller = "CustomerArea", action = "Index" })).VirtualPath;

            // Check if there is a request url
            if (filterContext.HttpContext.Request.Params["ReturnUrl"] != null && urlH.IsLocalUrl(filterContext.HttpContext.Request.Params["ReturnUrl"]))
            {
                url = filterContext.HttpContext.Request.Params["ReturnUrl"];
            }

            // Redirect the user back to the customer service index page
            filterContext.HttpContext.Response.Redirect(url, true);
        }
        else
        {
            // Continue to the base
            base.OnException(filterContext);
        }
    }
}

这是使用示例

        [HttpPost]
        **[RedirectOnError]**
        [ValidateAntiForgeryToken]
        public ActionResult LogOn(LogOnViewModel model, UserSessionState session, string returnUrl)
        {
        .....
        }